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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ed7810169d7f01e7c42bb67cf50ec6427deebfb3d95ba06bb15680ca34d3595' 
  AND token = 'R2YDhyFiSJvP5bCvwW3Yjy4csqsA13MPl0Opzts2c/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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