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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d75b55a42f0fb9ba308884b0f035c7ef2497140229aab6690bd27e201b0d01b' 
  AND token = '8sS5Zr4+uEf5ZkvIND8Fi83biZxsVw7n1dkVn5LrV+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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