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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ced3dc39b5b051ac37606d4defd61cba16e2d6b8425a86bcb202acf3c97b45aa' 
  AND token = '8U+13qNLIVdrerQRbSYTWnS8ZkWfE4jtHbex16ZZYCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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