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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bb42cca802c9bce8be2456e5deddc866c9f7eafcfbd89362116b490c7620f28' 
  AND token = '71tDH/uvcFGglQKWREHnBUsqlWU7iD4Bh0z56F21TV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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