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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8affb1bc076fdb4dbd8e754268bef3dac0ad8bd3c46fbce9bf31648acfd4cd65' 
  AND token = 'yAGiQjcyVswVLU/r4YbOuFRMQueAByM1JKBPdpeFiwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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