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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23b7248229779fbb3f82248e0d08f75446358590b01c2516ed92407cdafc4889' 
  AND token = 't2haHfoA93AlC7yrrb9kX6PB7+HBqWqe3KjkoEt11Iw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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