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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a30087e2f2efd7526c528f351cc50b122b4a20dfdaa849c87d3d3be5f136211d' 
  AND token = 'MBwwon9025FVDNwn9SeMN0W+uZjD05EpFyx/7pFQzmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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