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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05d15c69075ea9a9c47d7b68dfee9a5c9d9f639d8b1961f9f3a44f7840bbe81e' 
  AND token = 'mnHdIhDqORDwcDS5NIHHsTv20souIwodC7gZ0bZqFZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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