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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b61ccc597ba69d9a0f6a9bfd516903bb85417f1144b0960631b2aac1f6e8b04d' 
  AND token = 'xwBJC6sBZNi8wUuh255FqoHwZnZ4jqLN8b8ybslihT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00074

JSON explain

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