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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47d517d0a865ef5fc75b1d1fc596298d1d206cde3cd2380223d62ce5a27f524f' 
  AND token = 'c3Pp+gUkO9OHgPFBpEhf323txv35LS4e8cG7T1AG7Yw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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