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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29f6b3e4878151e1be7ab7603903217d5109b84fccacb9c923a2833efac89eae' 
  AND token = '0fAya0ZXBS21lQrbtgm4iEN183T5syLFv1fy2bTgkbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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