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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e02280e449c830e589ba6aa81eeecab248b2845be2f98de884b04d1690cca32' 
  AND token = 'bczL1uoSkf/xdT/SIKwnxsKdH/qo6sSG6ngpw2c7FSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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