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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7299ab2d1b1399c643a195efcba2f9100f99a7a49f318bf3e33318dabcc7a0b' 
  AND token = 'mA99Mq6Eo5Nmaj1ARW7AIm4832KgV+McSa/CgclBmLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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