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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58457623af823d4bdd4d7a04fdb453edd61a0d23ce7cccfbf755c5a8adfb186b' 
  AND token = 'LbnYty/3e39smU5voun8Db4Um4xFUSNah+DDbybDZtI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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