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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d7fc77747c9fab1b6cbb984e40b1eb899525a6b8aa28bc02df5ca6244cc932d' 
  AND token = 'ngO81/thgXmk7EX6/sRdp6EhEhe5AYP4yvKpoEtjnZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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