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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44fa5073f375c1f678b2600cb22efd06429594221b9f6be71f925a015db6243c' 
  AND token = 'BYtgkjuvgWseGXSyr10J8SYj6UPOAa2WRyc3ckblXU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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