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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f042fd4d7e8aa51dc3b747628e79a0f63afa00e24110f5ed96f1696be857909' 
  AND token = 'OiaRU3szV4hBo5gs4Cs9jISa+VdJ7f32QSCR70WNoNc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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