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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb6e5eb8cd9774950f1fb59029c2c69e1ec1bb9d859c4ce77410b38179e708ef' 
  AND token = 'kPVfJo7dDuHw1x5E4lX+TNrybnykzGNfWJ/p388eJTk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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