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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf82d247b8072190a923b91ebdad9834f0e12db906a9b8c96415ca23b17b3a7d' 
  AND token = 'YLKLd2zS9KdfZYvnoSXFu0NTdCuFzI4sQtDZS0MuoV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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