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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9948f52e9f5a8b74926cfa52359d858d61f0819c86c7e9f4c599fe45f310a74' 
  AND token = 'o/JSSZFIad9iiXv5OwJvb7/9gB6jlkkePlPHM9Nzq8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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