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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34dfc58f6873c43dedb02df2cde4d8f1ac991b438f3d2d8e6e6aba7e388be7eb' 
  AND token = 'uU8KQ7AG357PPBjb9isnBraH7DOD9cmOM+waBwo2iWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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