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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '524881169e982e21ff3511db57ca08c0f4cc955028a2bfb39d236db74d81b733' 
  AND token = 'o0VRXugfM3CGAbV6VwZ9gMfvPSpycqq54XVH7af8XEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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