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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '210a42988ffbf21d5eea06ad3b054ee006a8ec58e934e8d8e9339bdbff370ced' 
  AND token = 'd8wd8AUSJGdokKxk19hTYDqylpAkhK04w7Yy6LuZfpY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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