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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '905fe57124f5a140d95a5e7e7d93f84b5fa405610e85cbb9799a75fde9d67239' 
  AND token = '7y4UIFpKANumxPrVnOVeM9i7NMmEARKGN+JRcWQHO6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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