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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '832b5f07830d1b168234ccce8d7ad1da0e0cc70ad579f84936f50ceccf83d910' 
  AND token = '05ZC3J3FUWad+IAX//aBcZkSXj7ODYU1aYISYbmwBlI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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