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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15baea08670fe55aaa523a5e99a1b8429e49fea80274eca904e30d504a4306aa' 
  AND token = 'Wh3k6diWmIyO5te5cb/jceuwNeeoEp9X0Q0k2TMh/UA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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