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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1169f0e70c25efbdd072bcc09e19580d22ddafe0247ce34997c470ce20d7c90d' 
  AND token = 'EIeLTli7s16n1qcihTTBxkpY9m02Kj6ljf0c8k5QXgs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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