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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a2dbe8140a26748635773bcabfc94987320f1c2b3094e7b99c206f7c4b0cacc' 
  AND token = '0W2UNEaD02hhdhlLZDAiIN5o87jf00DorJd8F2H4lGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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