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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a30e67a857e70a1adbb4b8e83811b33f7a1831b931dba957f76eb1afdaebc50' 
  AND token = '1uPcHAgtpGDjfbRYiRy+2gnGG8XjaMhc4VBg2duyC9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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