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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75c95efe57d5cd29c66eda9aa24f76646779ffe5e76f4722630769661b5a2b60' 
  AND token = '4moTb+Fj4otiXWQqrK62kC0x/oWdrbqWF/NQE9Dg3H4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}