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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5d5c584c6ba42cdb66c19d83247961bb97242c9ddf0a7d00d72202e2e85c0bf' 
  AND token = 'urL1nXDDti4cOUKyQpkhmN0VIOIHiso69l7meEh5pK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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