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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a68d7945b41389be680c6c4e530455859237ef4f0eacdbc008dd7971d1a6a81d' 
  AND token = '67sUa+wpRARoQeiDJFaL0KLUpf6G+tTIP4Ga2Sd/UJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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