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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa77c5ba8d5e83743562757b3eae61724884572c52f2e94e4c2398248f53e64e' 
  AND token = '6MsnmFEfmo5octr3o4bggA+yAmvHQs+6BcsKGB8tB6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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