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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a7ff1ecc4fa837be354a190b1eec8e156e4e1f6c5e6ff8615973eb59c799c65' 
  AND token = '1Q7l3S8nrRmQjAWIg0PEQPFzS+jUS3yRuPvz9bQaQrs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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