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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b04dedda23494a492e29cbfa69b72d2c7979994aafe8ec7d24d4c07e540959a1' 
  AND token = 'EzYPCI7QfVXrJaWNsJ0O5SwpOlF7xGrkcSelYIwdE2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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