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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f0728cb185a11ee50146d9505686d7d2aa917c5508797cb8894e5c83786ad7a' 
  AND token = '7JajdVyTllTpnfzta7tBpAMlnnKZb8RbIu3476AtBlw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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