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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2b9cc212a0b944803e12b83d68288647a5afcf238b9df8bdbf9154fcf063e23' 
  AND token = 'SmOFA6/al5k566BK5V1A73v1qdm0X6PBxbPuKVCPjg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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