SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b8f1121bdf0b1dfa633c151d2f6219894f119adc8fcad52c047be14982561f7' 
  AND token = 'dPMsZWz/JFbUsmjJnNwl5pmDQou7Thr4lVRGZPFPdDI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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