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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7480e5e9fe5c25b885b6b75d6da6adee612cd096f7e14cc47ac935f9c8797dd5' 
  AND token = '/3s2P8o3AoZK9+Cj/FkKZc/wfAKzPObR0S64osOzu/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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