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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1815b314ca220da7face1377cb81eb6701726af3b3626af65afb32a4e501f288' 
  AND token = 'PDmQOQo12OtTxWrU611zLmMDjuoolsf1L+U8tg5VW58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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