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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7ebf2bcf2be6f8daffb16b6f8175b3bc24a45be6b618302264a803fca540d6d' 
  AND token = '2fJ7zgTyLhd5U829W4HTuDx4vLAOyqS3fPO/hSSvgf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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