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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c924348089e27d834f8490fb9a7607973b41d0a9dbaa18641d1c85ffec6d6a0' 
  AND token = 'mkWwAa4RRE7GBxnezTwUm/jRGsY/4DF+obhkTI3NFnk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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