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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96b7cdd13bd2ff5df8de6ac06646d53a7c2de4cf0761123336d5b6cd2c37dff6' 
  AND token = 'mnC8n+bnOfo6+3FH31HcBQvTZ6oNZ2CjsynB8K51i04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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