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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08ba5bc77754e98900e7cf7f815348db421f0526d0f732a8d90ff72a281b9bbb' 
  AND token = 'JhxVbVBlMyDnamqrXhJLkKgx0U7PZWqI4RNUTdJoUxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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