SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98e4234ee4681569b84edee212ad6bf05814c4f67385089b712531aaab8d535c' 
  AND token = 'RguPb9v7r4cvZmpUD3zwjHfxsi8Y9vCGEhFrf3+AJNw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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