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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a20dd15b06b025c630ac04a8d38304b5994171a59101c397440a284253fee5a9' 
  AND token = 'YZbcqDnZuaqp2eq71g/2gPIo/QwLUENZY6JDodKG7Os=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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