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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c2bf5b69c9295eb14cfdab05d45206dfe271984a2192d71dd6fc5e3db7efa0c' 
  AND token = 'u3CwO8mn271PoBFHj9fVep2AO+dPFKfWfwMStsn2gDw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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