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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9a4269eca5ae54cd4be47bf7dd5dce928b05a482e84dc80626dcdd2600a800c' 
  AND token = 'Ha7J9hV2RyTYgSC+T3Z41unpqLRYq5NG4LMet1wOIg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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