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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5335d5684c5c9e96de4fbc20937b4c1aa6c004b70d4982fc472bcee22a76df90' 
  AND token = '8t6md0CgeZLQd1kCAGHux6fTNB/+cqhPkqzG7Yv2/ok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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