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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6985d781ca6ab6048453567a1a1ebf8bd8a2bb3dc3e7f171720bb3c10aa59340' 
  AND token = 'dIjeqpxxY1KGKnBH8B9S0FuCUw/B99rN+WybKUCZ6bM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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