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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa2c2d1905ed4b688516d47a3728e948d33042db9b508da1cf8910c0f5ac6f2d' 
  AND token = 'Hp2ICUe2URfkyWFN9O3hr7N4B70OlBvwv++CEOa0fA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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