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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '717fb6d6e4c25740bf5b480e74ea940c7f6f23b2c284c199d2388ff2f642ad4b' 
  AND token = 'MSnmk41KEx0aIFQgoDhVhialaoQ1NfLj6+z3nkU6+Zs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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