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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afa38405b392e4359a8f0a5657f9a1e0cc57d81bf2c54062a64c5b504a6dc0d9' 
  AND token = 'Uf4L9zesNJNgq5FELEFYWqHOilg0i7Oqikqj0T5WZvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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