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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5665bd59a9c5071e8aa69caaffcfd3185c4ffc886b7a63083f89ad1411f538d6' 
  AND token = 'Ggbn/VDhxj008YyIpCxqfvFkBjisRRcGIe6dBvrjSDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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