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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd33b16ca044a3fd8ce1f1fe82ee7997832905876aefee6b05f3f08afc30387fd' 
  AND token = 'PMGsHQd1gJvbNMmSa/VxijaMFcIEkoftcF+3O+kr1Xw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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