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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d7c375361708f334ece733120815a2028bf7d1367b253b19e7394205d76f3ca' 
  AND token = 'w7HTcxjF+N6yaV6f4iZM2THFtyDe+O/aDA+9gLXfsss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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