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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fc13f00090a2749636268ddba9ec825285de23ccdecc85092c0345aecdea7a9' 
  AND token = '2oqm0V+LFtHaYGWC2bjxdW4qsAuJ9RcAPGyK42Vv26U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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