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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8eba9ebdef6d6ce86ba945e8d155c28a0ec9f72130c991f44ff8b05ed390e750' 
  AND token = 'whGDw0+sw+PgruTZnk0gfV2dtLo7+Jv9Tbp08u1wwT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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