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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '330c500bd21ddd839cfcca3f83fc9f849df67c5543dfb42fd5020e9af2c7e8b8' 
  AND token = '+RK2vrnxNe4p3jgvhMw1KYhWWX1E+Swy72dei/18heM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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