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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecc7a6554f36872c5044afd7d0fe82032c5540b80b7f708c6def7d0bec33c1e8' 
  AND token = 'Nu4X6vGNTG3pLc3f3mqSd7Ojn2LoX1NQZ6U4DI3NfFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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