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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6781bb2e13026211d89d36eb1ae0c84212fce15b68f677b3cce5238dd36298f4' 
  AND token = 'BW6k+pi9uU4QGTNfCKAa3pbJAVgS0rXQ8yap/a8MxgU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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