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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b0c51678bacbcb4de7aeef5d0cc31e1c9bab6eaa28f735889f0e5d8d9cd029b' 
  AND token = 'wXYJmOCm1ySy71OwAkTxiReEc3BRUeiSAPD4KBBBglo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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